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Senior Notes (Tables) | 9 Months Ended
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Jun. 30, 2023
Debt Disclosure [Abstract] |
Carrying Amounts and Fair Values of Senior Notes | The following table presents the face values and fair values for the Senior Notes at June 30, 2023 and September 30, 2022:
| June 30, 2023 |  | September 30, 2022
| Face Value (*) |  | Fair Value |  | Face Value (*) |  | Fair Value
| (In thousands)
The 2018 Senior Notes | $ | 400,000 |  |  | $ | 391,000 |  |  | $ | 400,000 |  |  | $ | 381,500 |
The 2019 Senior Notes and the 2021 Senior Notes | 900,000 |  |  | 819,000 |  |  | 900,000 |  |  | 767,250 |
Total | $ | 1,300,000 |  |  | $ | 1,210,000 |  |  | $ | 1,300,000 |  |  | $ | 1,148,750 |
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $12.2 million and $14.3 million at June 30, 2023 and September 30, 2022, respectively.

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